./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.09.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.09.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 834ccc2d6e5ce947bfece9c1e11f57131346eaac8927553a9495d7568350ac6e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:57:51,981 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:57:51,983 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:57:52,022 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:57:52,025 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:57:52,027 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:57:52,029 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:57:52,032 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:57:52,035 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:57:52,037 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:57:52,043 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:57:52,047 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:57:52,048 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:57:52,055 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:57:52,058 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:57:52,060 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:57:52,061 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:57:52,063 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:57:52,065 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:57:52,068 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:57:52,071 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:57:52,072 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:57:52,074 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:57:52,076 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:57:52,080 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:57:52,081 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:57:52,081 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:57:52,082 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:57:52,083 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:57:52,085 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:57:52,085 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:57:52,086 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:57:52,088 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:57:52,089 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:57:52,090 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:57:52,091 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:57:52,092 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:57:52,092 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:57:52,093 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:57:52,094 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:57:52,095 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:57:52,096 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:57:52,135 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:57:52,136 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:57:52,137 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:57:52,137 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:57:52,139 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:57:52,140 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:57:52,140 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:57:52,141 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:57:52,141 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:57:52,141 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:57:52,142 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:57:52,142 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:57:52,143 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:57:52,143 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:57:52,144 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:57:52,145 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:57:52,145 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:57:52,145 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:57:52,146 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:57:52,146 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:57:52,147 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:57:52,147 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:57:52,148 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:57:52,148 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:57:52,148 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:57:52,149 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:57:52,149 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:57:52,150 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:57:52,150 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:57:52,150 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:57:52,151 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:57:52,151 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:57:52,152 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:57:52,152 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:57:52,153 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:57:52,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:57:52,159 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:57:52,160 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:57:52,160 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:57:52,160 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 834ccc2d6e5ce947bfece9c1e11f57131346eaac8927553a9495d7568350ac6e [2021-11-07 00:57:52,471 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:57:52,500 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:57:52,502 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:57:52,504 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:57:52,505 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:57:52,506 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/systemc/token_ring.09.cil-1.c [2021-11-07 00:57:52,575 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/data/7a254989f/36d6d97b1a034803bf271f2feb633cfe/FLAG4d6c8b104 [2021-11-07 00:57:53,178 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:57:53,179 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/sv-benchmarks/c/systemc/token_ring.09.cil-1.c [2021-11-07 00:57:53,199 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/data/7a254989f/36d6d97b1a034803bf271f2feb633cfe/FLAG4d6c8b104 [2021-11-07 00:57:53,507 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/data/7a254989f/36d6d97b1a034803bf271f2feb633cfe [2021-11-07 00:57:53,512 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:57:53,515 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:57:53,520 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:57:53,521 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:57:53,525 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:57:53,526 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:57:53" (1/1) ... [2021-11-07 00:57:53,530 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@213f7407 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:53, skipping insertion in model container [2021-11-07 00:57:53,530 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:57:53" (1/1) ... [2021-11-07 00:57:53,539 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:57:53,600 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:57:53,786 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/sv-benchmarks/c/systemc/token_ring.09.cil-1.c[671,684] [2021-11-07 00:57:54,024 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:57:54,043 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:57:54,066 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/sv-benchmarks/c/systemc/token_ring.09.cil-1.c[671,684] [2021-11-07 00:57:54,192 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:57:54,223 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:57:54,224 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54 WrapperNode [2021-11-07 00:57:54,224 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:57:54,225 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:57:54,226 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:57:54,226 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:57:54,236 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (1/1) ... [2021-11-07 00:57:54,260 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (1/1) ... [2021-11-07 00:57:54,409 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:57:54,410 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:57:54,411 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:57:54,412 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:57:54,422 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (1/1) ... [2021-11-07 00:57:54,423 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (1/1) ... [2021-11-07 00:57:54,446 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (1/1) ... [2021-11-07 00:57:54,447 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (1/1) ... [2021-11-07 00:57:54,491 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (1/1) ... [2021-11-07 00:57:54,545 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (1/1) ... [2021-11-07 00:57:54,555 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (1/1) ... [2021-11-07 00:57:54,572 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:57:54,573 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:57:54,577 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:57:54,577 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:57:54,579 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (1/1) ... [2021-11-07 00:57:54,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:57:54,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:57:54,626 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:57:54,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d628bfb1-6cc9-43b2-bdff-fc16bb86fcdd/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:57:54,694 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:57:54,695 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 00:57:54,695 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:57:54,695 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:58:00,189 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:58:00,190 INFO L299 CfgBuilder]: Removed 376 assume(true) statements. [2021-11-07 00:58:00,195 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:58:00 BoogieIcfgContainer [2021-11-07 00:58:00,195 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:58:00,199 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:58:00,199 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:58:00,202 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:58:00,203 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:57:53" (1/3) ... [2021-11-07 00:58:00,204 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@657fee51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:58:00, skipping insertion in model container [2021-11-07 00:58:00,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54" (2/3) ... [2021-11-07 00:58:00,204 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@657fee51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:58:00, skipping insertion in model container [2021-11-07 00:58:00,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:58:00" (3/3) ... [2021-11-07 00:58:00,206 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.09.cil-1.c [2021-11-07 00:58:00,214 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:58:00,214 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 00:58:00,283 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:58:00,292 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 00:58:00,292 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 00:58:00,337 INFO L276 IsEmpty]: Start isEmpty. Operand has 583 states, 581 states have (on average 1.5301204819277108) internal successors, (889), 582 states have internal predecessors, (889), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:00,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-07 00:58:00,351 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:00,352 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:00,352 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:00,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:00,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1311219387, now seen corresponding path program 1 times [2021-11-07 00:58:00,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:00,368 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837935776] [2021-11-07 00:58:00,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:00,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:00,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:00,602 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:00,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:00,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837935776] [2021-11-07 00:58:00,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837935776] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:00,604 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:00,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:00,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574390722] [2021-11-07 00:58:00,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:00,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:00,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:00,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:00,636 INFO L87 Difference]: Start difference. First operand has 583 states, 581 states have (on average 1.5301204819277108) internal successors, (889), 582 states have internal predecessors, (889), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:01,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:01,086 INFO L93 Difference]: Finished difference Result 2164 states and 3287 transitions. [2021-11-07 00:58:01,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:01,088 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-07 00:58:01,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:01,124 INFO L225 Difference]: With dead ends: 2164 [2021-11-07 00:58:01,124 INFO L226 Difference]: Without dead ends: 1577 [2021-11-07 00:58:01,136 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:01,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1577 states. [2021-11-07 00:58:01,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1577 to 1500. [2021-11-07 00:58:01,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1500 states, 1499 states have (on average 1.4923282188125417) internal successors, (2237), 1499 states have internal predecessors, (2237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:01,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1500 states to 1500 states and 2237 transitions. [2021-11-07 00:58:01,298 INFO L78 Accepts]: Start accepts. Automaton has 1500 states and 2237 transitions. Word has length 40 [2021-11-07 00:58:01,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:01,299 INFO L470 AbstractCegarLoop]: Abstraction has 1500 states and 2237 transitions. [2021-11-07 00:58:01,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:01,299 INFO L276 IsEmpty]: Start isEmpty. Operand 1500 states and 2237 transitions. [2021-11-07 00:58:01,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 00:58:01,313 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:01,313 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:01,314 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 00:58:01,314 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:01,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:01,315 INFO L85 PathProgramCache]: Analyzing trace with hash -850965976, now seen corresponding path program 1 times [2021-11-07 00:58:01,315 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:01,315 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337888396] [2021-11-07 00:58:01,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:01,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:01,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:01,449 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 00:58:01,450 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:01,450 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337888396] [2021-11-07 00:58:01,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337888396] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:01,451 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:01,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:01,451 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646691406] [2021-11-07 00:58:01,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:01,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:01,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:01,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:01,454 INFO L87 Difference]: Start difference. First operand 1500 states and 2237 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:01,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:01,837 INFO L93 Difference]: Finished difference Result 5668 states and 8426 transitions. [2021-11-07 00:58:01,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:01,838 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-07 00:58:01,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:01,872 INFO L225 Difference]: With dead ends: 5668 [2021-11-07 00:58:01,872 INFO L226 Difference]: Without dead ends: 4180 [2021-11-07 00:58:01,876 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:01,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4180 states. [2021-11-07 00:58:02,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4180 to 4007. [2021-11-07 00:58:02,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4007 states, 4006 states have (on average 1.4655516724912632) internal successors, (5871), 4006 states have internal predecessors, (5871), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:02,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4007 states to 4007 states and 5871 transitions. [2021-11-07 00:58:02,091 INFO L78 Accepts]: Start accepts. Automaton has 4007 states and 5871 transitions. Word has length 55 [2021-11-07 00:58:02,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:02,092 INFO L470 AbstractCegarLoop]: Abstraction has 4007 states and 5871 transitions. [2021-11-07 00:58:02,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:02,093 INFO L276 IsEmpty]: Start isEmpty. Operand 4007 states and 5871 transitions. [2021-11-07 00:58:02,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-07 00:58:02,098 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:02,098 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:02,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 00:58:02,099 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:02,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:02,100 INFO L85 PathProgramCache]: Analyzing trace with hash 443500460, now seen corresponding path program 1 times [2021-11-07 00:58:02,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:02,100 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638541070] [2021-11-07 00:58:02,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:02,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:02,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:02,219 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 00:58:02,219 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:02,220 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638541070] [2021-11-07 00:58:02,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638541070] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:02,220 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:02,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:02,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629758034] [2021-11-07 00:58:02,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:02,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:02,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:02,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:02,223 INFO L87 Difference]: Start difference. First operand 4007 states and 5871 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:02,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:02,886 INFO L93 Difference]: Finished difference Result 15198 states and 22193 transitions. [2021-11-07 00:58:02,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:02,886 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-07 00:58:02,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:02,956 INFO L225 Difference]: With dead ends: 15198 [2021-11-07 00:58:02,957 INFO L226 Difference]: Without dead ends: 11210 [2021-11-07 00:58:02,968 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:02,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11210 states. [2021-11-07 00:58:03,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11210 to 10842. [2021-11-07 00:58:03,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10842 states, 10841 states have (on average 1.4398118254773544) internal successors, (15609), 10841 states have internal predecessors, (15609), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:03,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10842 states to 10842 states and 15609 transitions. [2021-11-07 00:58:03,631 INFO L78 Accepts]: Start accepts. Automaton has 10842 states and 15609 transitions. Word has length 58 [2021-11-07 00:58:03,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:03,633 INFO L470 AbstractCegarLoop]: Abstraction has 10842 states and 15609 transitions. [2021-11-07 00:58:03,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:03,633 INFO L276 IsEmpty]: Start isEmpty. Operand 10842 states and 15609 transitions. [2021-11-07 00:58:03,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-07 00:58:03,639 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:03,639 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:03,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 00:58:03,641 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:03,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:03,642 INFO L85 PathProgramCache]: Analyzing trace with hash 763119579, now seen corresponding path program 1 times [2021-11-07 00:58:03,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:03,642 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45214720] [2021-11-07 00:58:03,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:03,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:03,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:03,813 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 00:58:03,813 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:03,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45214720] [2021-11-07 00:58:03,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [45214720] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:03,814 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:03,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:03,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677684872] [2021-11-07 00:58:03,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:03,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:03,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:03,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:03,817 INFO L87 Difference]: Start difference. First operand 10842 states and 15609 transitions. Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:05,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:05,201 INFO L93 Difference]: Finished difference Result 40989 states and 58814 transitions. [2021-11-07 00:58:05,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:05,202 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-07 00:58:05,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:05,344 INFO L225 Difference]: With dead ends: 40989 [2021-11-07 00:58:05,344 INFO L226 Difference]: Without dead ends: 30173 [2021-11-07 00:58:05,371 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:05,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30173 states. [2021-11-07 00:58:06,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30173 to 29453. [2021-11-07 00:58:06,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29453 states, 29452 states have (on average 1.4151500746978134) internal successors, (41679), 29452 states have internal predecessors, (41679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:06,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29453 states to 29453 states and 41679 transitions. [2021-11-07 00:58:06,896 INFO L78 Accepts]: Start accepts. Automaton has 29453 states and 41679 transitions. Word has length 61 [2021-11-07 00:58:06,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:06,897 INFO L470 AbstractCegarLoop]: Abstraction has 29453 states and 41679 transitions. [2021-11-07 00:58:06,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:06,898 INFO L276 IsEmpty]: Start isEmpty. Operand 29453 states and 41679 transitions. [2021-11-07 00:58:06,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 00:58:06,908 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:06,909 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:06,909 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 00:58:06,909 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:06,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:06,910 INFO L85 PathProgramCache]: Analyzing trace with hash 1183773565, now seen corresponding path program 1 times [2021-11-07 00:58:06,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:06,911 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691596488] [2021-11-07 00:58:06,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:06,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:06,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:07,086 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 00:58:07,086 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:07,087 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691596488] [2021-11-07 00:58:07,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1691596488] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:07,087 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:07,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:07,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142973066] [2021-11-07 00:58:07,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:07,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:07,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:07,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:07,092 INFO L87 Difference]: Start difference. First operand 29453 states and 41679 transitions. Second operand has 4 states, 4 states have (on average 15.5) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:09,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:09,600 INFO L93 Difference]: Finished difference Result 110896 states and 156439 transitions. [2021-11-07 00:58:09,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:09,601 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-07 00:58:09,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:09,862 INFO L225 Difference]: With dead ends: 110896 [2021-11-07 00:58:09,863 INFO L226 Difference]: Without dead ends: 81472 [2021-11-07 00:58:09,959 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:10,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81472 states. [2021-11-07 00:58:12,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81472 to 79980. [2021-11-07 00:58:13,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79980 states, 79979 states have (on average 1.391577789169657) internal successors, (111297), 79979 states have internal predecessors, (111297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:13,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79980 states to 79980 states and 111297 transitions. [2021-11-07 00:58:13,304 INFO L78 Accepts]: Start accepts. Automaton has 79980 states and 111297 transitions. Word has length 64 [2021-11-07 00:58:13,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:13,305 INFO L470 AbstractCegarLoop]: Abstraction has 79980 states and 111297 transitions. [2021-11-07 00:58:13,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:13,306 INFO L276 IsEmpty]: Start isEmpty. Operand 79980 states and 111297 transitions. [2021-11-07 00:58:13,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 00:58:13,324 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:13,324 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:13,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 00:58:13,325 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:13,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:13,326 INFO L85 PathProgramCache]: Analyzing trace with hash -901147917, now seen corresponding path program 1 times [2021-11-07 00:58:13,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:13,326 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253224369] [2021-11-07 00:58:13,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:13,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:13,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:13,445 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:13,446 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:13,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253224369] [2021-11-07 00:58:13,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1253224369] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:13,447 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:13,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:13,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341050601] [2021-11-07 00:58:13,448 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:13,448 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:13,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:13,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:13,450 INFO L87 Difference]: Start difference. First operand 79980 states and 111297 transitions. Second operand has 4 states, 4 states have (on average 16.75) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:16,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:16,399 INFO L93 Difference]: Finished difference Result 182853 states and 255623 transitions. [2021-11-07 00:58:16,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:16,400 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-07 00:58:16,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:16,745 INFO L225 Difference]: With dead ends: 182853 [2021-11-07 00:58:16,746 INFO L226 Difference]: Without dead ends: 102908 [2021-11-07 00:58:16,895 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:17,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102908 states. [2021-11-07 00:58:19,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102908 to 91836. [2021-11-07 00:58:19,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91836 states, 91835 states have (on average 1.3963957096967388) internal successors, (128238), 91835 states have internal predecessors, (128238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:20,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91836 states to 91836 states and 128238 transitions. [2021-11-07 00:58:20,241 INFO L78 Accepts]: Start accepts. Automaton has 91836 states and 128238 transitions. Word has length 67 [2021-11-07 00:58:20,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:20,242 INFO L470 AbstractCegarLoop]: Abstraction has 91836 states and 128238 transitions. [2021-11-07 00:58:20,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:20,243 INFO L276 IsEmpty]: Start isEmpty. Operand 91836 states and 128238 transitions. [2021-11-07 00:58:20,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 00:58:20,259 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:20,259 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:20,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 00:58:20,260 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:20,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:20,260 INFO L85 PathProgramCache]: Analyzing trace with hash -1417730380, now seen corresponding path program 1 times [2021-11-07 00:58:20,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:20,266 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437011928] [2021-11-07 00:58:20,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:20,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:20,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:20,349 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:20,350 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:20,350 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437011928] [2021-11-07 00:58:20,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437011928] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:20,351 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:20,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:20,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312721182] [2021-11-07 00:58:20,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:20,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:20,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:20,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:20,361 INFO L87 Difference]: Start difference. First operand 91836 states and 128238 transitions. Second operand has 4 states, 4 states have (on average 17.0) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:26,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:26,164 INFO L93 Difference]: Finished difference Result 339865 states and 473700 transitions. [2021-11-07 00:58:26,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:26,165 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 00:58:26,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:27,013 INFO L225 Difference]: With dead ends: 339865 [2021-11-07 00:58:27,014 INFO L226 Difference]: Without dead ends: 248064 [2021-11-07 00:58:27,131 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:27,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248064 states. [2021-11-07 00:58:32,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248064 to 172636. [2021-11-07 00:58:33,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172636 states, 172635 states have (on average 1.396211660439656) internal successors, (241035), 172635 states have internal predecessors, (241035), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:33,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172636 states to 172636 states and 241035 transitions. [2021-11-07 00:58:33,953 INFO L78 Accepts]: Start accepts. Automaton has 172636 states and 241035 transitions. Word has length 68 [2021-11-07 00:58:33,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:33,954 INFO L470 AbstractCegarLoop]: Abstraction has 172636 states and 241035 transitions. [2021-11-07 00:58:33,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:33,954 INFO L276 IsEmpty]: Start isEmpty. Operand 172636 states and 241035 transitions. [2021-11-07 00:58:33,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 00:58:33,985 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:33,986 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:33,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 00:58:33,987 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:33,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:33,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1793783346, now seen corresponding path program 1 times [2021-11-07 00:58:33,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:58:33,988 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106263696] [2021-11-07 00:58:33,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:33,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:58:34,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:34,064 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:34,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:58:34,065 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106263696] [2021-11-07 00:58:34,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2106263696] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:34,065 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:34,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:58:34,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097490848] [2021-11-07 00:58:34,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:34,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:58:34,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:34,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:34,067 INFO L87 Difference]: Start difference. First operand 172636 states and 241035 transitions. Second operand has 4 states, 4 states have (on average 17.25) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:46,304 INFO L93 Difference]: Finished difference Result 636477 states and 887091 transitions. [2021-11-07 00:58:46,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:46,304 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.25) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 00:58:46,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:47,373 INFO L225 Difference]: With dead ends: 636477 [2021-11-07 00:58:47,373 INFO L226 Difference]: Without dead ends: 463876 [2021-11-07 00:58:47,637 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:48,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463876 states.